* {
  margin: 0;
  padding: 0;
}
html,
body,
#app,
.wrapper {
    width: 100%;
    height: 100%;
    overflow: hidden;
}
body {
  font-family: 'PingFang SC', "Helvetica Neue", Helvetica, "microsoft yahei", arial, STHeiTi, sans-serif;
}
a {
  text-decoration: none
}
.text-red {
  color: red;
}